By __________ a cheaper material for the steel in our products, we can greatl...

作者: tihaiku 人气: - 评论: 0
问题 By __________ a cheaper material for the steel in our products, we can greatly reduce manufacturing costs.
选项 A.substituting B.replacing C.alternating D.displacing
答案 A
解析 句子表示“用更便宜的材料代替钢铁”,意为“用A代替8”的词组"substitute A for B”放在空格处的句意最自然,故选A。

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